<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <!-- 隐藏的文件选择框 => 大用!!! -->
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="handleChange"
        >

        <div class="drop">
          <i class="el-icon-upload" />
          <el-button
            type="text"
            @click="downloadTemplate"
          >下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="upload">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button
        size="mini"
        type="primary"
        @click="$emit('update:showExcelDialog', false)"
      >取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import { downloadTemplate, uploadExcel } from '@/api/employee'
import { saveAs } from 'file-saver'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    async downloadTemplate() {
      const blob = await downloadTemplate() // 模板文件的二进制文件流
      saveAs(blob, '员工导入模板.xlsx')
    },
    upload() {
      // 隔山打牛 => 页面中有一个隐藏的文件选择框(丑) 你可以触发他的点击事件 从而打开他的文件资源管理器
      // 中括号语法 麻烦但万能  obj.name  obj.age   obj['name']  obj['age']
      // console.log(this.$refs['excel-upload-input'])
      this.$refs['excel-upload-input'].click()
    },
    async handleChange(e) {
      // 选择了文件就会触发change事件 => 如果选中的是相同的文件就不会触发
      console.log('上传', e.target.files[0])

      try {
        await uploadExcel(e.target.files[0])
        this.$message.success('批量新增成功')
        this.$emit('refresh')
        this.$emit('update:showExcelDialog', false)

        // this.$refs['excel-upload-input'].value = '' // 清空文件选择框中的选中文件
      } catch {
        // this.$refs['excel-upload-input'].value = '' // 清空文件选择框中的选中文件
      } finally {
        this.$refs['excel-upload-input'].value = '' // 清空文件选择框中的选中文件
      }
    }
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
  margin: 20px;
  width: 360px;
  height: 180px;
  align-items: center;
  color: #697086;
  .excel-upload-input {
    display: none;
    z-index: -9999;
  }
  .btn-upload,
  .drop {
    border: 1px dashed #dcdfe6;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 160px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .drop {
    line-height: 40px;
    color: #bbb;
    i {
      font-size: 60px;
      display: block;
      color: #c0c4cc;
    }
  }
}
</style>
